Thank you for viewing! This is a temperature and humidity gauge for a Glass Harmony habitat. I bought it about a year ago, but I'm selling it because I have another temperature and humidity gauge in my room. It's the type that hangs on a hamster cage. It uses a button battery. Please see the second photo for more details. Operation has been confirmed. Fine scratches can be seen on the display surface depending on the angle. There is also a scratch about 1 cm long on the side. Please check the photos in the 8th image. In addition, I have checked for scratches and stains before listing, but there is a possibility that I may have overlooked something. Please purchase only if you understand that this is a used item.